ferrite machining?
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From: Archimedes' Lever on 13 Jun 2010 15:34 On Sun, 13 Jun 2010 07:41:34 -0700 (PDT), MooseFET <kensmith(a)rahul.net> wrote: >If you want accurate machining of a groove, you need a small grinder >mounted to a lathe. Doing it by hand is ok if you just need to make a >small notch or the like. > Actually, a bobbin winder is the right tool. A lathe, even on its slowest speed, is far to fast.
From: John Larkin on 13 Jun 2010 15:45 On Sun, 13 Jun 2010 13:54:22 -0500, John Fields <jfields(a)austininstruments.com> wrote: >On Sun, 13 Jun 2010 07:35:35 -0700 (PDT), MooseFET ><kensmith(a)rahul.net> wrote: > >>On Jun 13, 1:40 am, John Fields <jfie...(a)austininstruments.com> wrote: > >>> On Sat, 12 Jun 2010 09:20:37 -0700 (PDT), MooseFET > > >>> >All sintered things are brittle. Watch the temperature. >>> >>> --- >>> I don't believe that's right, since at least some (if not most) >>> sintered metallic parts retain the mechanical properties of their >>> parent metals or alloys. >> >>The cores I have experience with are metal oxides not metals. >>They are brittle. > >--- >Ah, but that's a subset of "all sintered things", yes? > There are some fairly soft sintered things, like sintered brass gas diffuser things. And sintered plastics. John
From: dagmargoodboat on 13 Jun 2010 16:24 On Jun 13, 9:37 am, MooseFET <kensm...(a)rahul.net> wrote: > On Jun 13, 1:21 am, BlindBaby > > > > <BlindMelonChit...(a)wellnevergetthatonethealbumcover.org> wrote: > > On Sat, 12 Jun 2010 09:29:32 -0700 (PDT), MooseFET <kensm...(a)rahul.net> > > wrote: > > > >On Jun 12, 8:30 pm, Grant <o...(a)grrr.id.au> wrote: > > >> On Fri, 11 Jun 2010 20:20:54 -0700 (PDT), MooseFET <kensm...(a)rahul.net> wrote: > > >[...] > > >> Anyway, 150 grit diamond tool rips into the stuff, black dust everywhere, > > >> easy to fracture pieces off, very harsh if one applies too much pressure. > > > >The problem is mostly the local temperature rise. If you are > > >careful, you can cut an O-ring groove into a rod core to seal > > >the place where it goes through a wall. Fine work can be > > >done but when making any sort of a groove a lot of care > > >is needed. > > > Your brain is on overkill, and you can't even get that right. > > I stand by my warning. What you claim doesn't matter because > I know I will be shown to be correct. Flooding with work with coolant would help. Keeps the dust down too. But yeah, it's messy. -- Cheers, James Arthur
From: Archimedes' Lever on 13 Jun 2010 16:34 On Sun, 13 Jun 2010 13:54:22 -0500, John Fields <jfields(a)austininstruments.com> wrote: >On Sun, 13 Jun 2010 07:35:35 -0700 (PDT), MooseFET ><kensmith(a)rahul.net> wrote: > >>On Jun 13, 1:40 am, John Fields <jfie...(a)austininstruments.com> wrote: > >>> On Sat, 12 Jun 2010 09:20:37 -0700 (PDT), MooseFET > > >>> >All sintered things are brittle. Watch the temperature. >>> >>> --- >>> I don't believe that's right, since at least some (if not most) >>> sintered metallic parts retain the mechanical properties of their >>> parent metals or alloys. >> >>The cores I have experience with are metal oxides not metals. >>They are brittle. > >--- >Ah, but that's a subset of "all sintered things", yes? > He wants to blow flame (hot air) over them now too.
From: Archimedes' Lever on 13 Jun 2010 16:53
On Sun, 13 Jun 2010 12:45:12 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Sun, 13 Jun 2010 13:54:22 -0500, John Fields ><jfields(a)austininstruments.com> wrote: > >>On Sun, 13 Jun 2010 07:35:35 -0700 (PDT), MooseFET >><kensmith(a)rahul.net> wrote: >> >>>On Jun 13, 1:40 am, John Fields <jfie...(a)austininstruments.com> wrote: >> >>>> On Sat, 12 Jun 2010 09:20:37 -0700 (PDT), MooseFET >> >> >>>> >All sintered things are brittle. Watch the temperature. >>>> >>>> --- >>>> I don't believe that's right, since at least some (if not most) >>>> sintered metallic parts retain the mechanical properties of their >>>> parent metals or alloys. >>> >>>The cores I have experience with are metal oxides not metals. >>>They are brittle. >> >>--- >>Ah, but that's a subset of "all sintered things", yes? >> > >There are some fairly soft sintered things, like sintered brass gas >diffuser things. And sintered plastics. > >John The filter elements are sintered with things like 'fine silt clay', and then the clay gets washed out after the sintering. leaving the porous medium behind. They can be brittle or be such that further press forming, etc. operations can be performed on them. There is 'nearly dry' concrete mix that gets applied and formed on the ground, and after drying are very very porous, because they did no vibrational settling of the dry mix. One ends up with a driveway that never gets a rain puddle on it. It absorbs hundreds of gallons of water, and transfers it beneath the slab for storage or transport to drainage. |